From c135446c89d59f4c92123e18c08b748708c749f9 Mon Sep 17 00:00:00 2001
From: Christophe Robillard <christophe@robiweb.net>
Date: Thu, 7 Aug 2025 23:31:30 +0200
Subject: [PATCH] send rfid tag uid

---
 the-cup.ino | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 the-cup.ino

diff --git a/the-cup.ino b/the-cup.ino
new file mode 100644
index 0000000..dfbfe63
--- /dev/null
+++ b/the-cup.ino
@@ -0,0 +1,135 @@
+#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager
+#include <ESP8266HTTPClient.h>
+
+#include <WiFiClient.h>
+
+#include <MFRC522v2.h>
+#include <MFRC522DriverSPI.h>
+#include <MFRC522DriverPinSimple.h>
+#include <MFRC522Debug.h>
+
+MFRC522DriverPinSimple ss_1_pin(4); // Configurable, take an unused pin, only HIGH/LOW required, must be different to SS 2.
+
+MFRC522DriverSPI driver_1{ss_1_pin};
+
+MFRC522 reader{driver_1};   // Create MFRC522 instance.
+
+
+
+void setup() {
+    // WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
+    // it is a good practice to make sure your code sets wifi mode how you want it.
+
+    // put your setup code here, to run once:
+    Serial.begin(115200);
+
+    pinMode(LED_BUILTIN, OUTPUT);
+
+    //WiFiManager, Local intialization. Once its business is done, there is no need to keep it around
+    WiFiManager wm;
+
+    // reset settings - wipe stored credentials for testing
+    // these are stored by the esp library
+    // wm.resetSettings();
+
+    // Automatically connect using saved credentials,
+    // if connection fails, it starts an access point with the specified name ( "AutoConnectAP"),
+    // if empty will auto generate SSID, if password is blank it will be anonymous AP (wm.autoConnect())
+    // then goes into a blocking loop awaiting configuration and will return success result
+
+    bool res;
+    // res = wm.autoConnect(); // auto generated AP name from chipid
+    // res = wm.autoConnect("AutoConnectAP"); // anonymous ap
+    res = wm.autoConnect("MoodBox"); // password protected ap
+
+    if(!res) {
+        Serial.println("Failed to connect");
+        // ESP.restart();
+    } 
+    else {
+        //if you get here you have connected to the WiFi    
+        Serial.println("connected...yeey :)");
+    }  
+
+
+    reader.PCD_Init(); // Init each MFRC522 card.
+  
+}
+
+void loop() {
+    // put your main code here, to run repeatedly:   
+    WiFiClient client;
+    HTTPClient http;
+
+    if (reader.PICC_IsNewCardPresent() && reader.PICC_ReadCardSerial()) {
+      // Show some details of the PICC (that is: the tag/card).
+      MFRC522Debug::PrintUID(Serial, reader.uid);
+      // Halt PICC.
+      reader.PICC_HaltA();
+      // Stop encryption on PCD.
+      reader.PCD_StopCrypto1();
+
+      Serial.print("[HTTP] begin...\n");
+      // configure traged server and url
+      http.begin(client, "http://192.168.1.32:3000/rfid_tags");  // HTTP
+      http.addHeader("Content-Type", "application/json");
+
+      Serial.print("[HTTP] POST...\n");
+      char str[32] = "";
+      array_to_string(reader.uid.uidByte, 4, str); //Insert (byte array, length, char array for output)
+      Serial.println(str); //Print the output uid string
+      // start connection and send HTTP header and body
+      int httpCode = http.POST("{\"identifier\":\"" + String(str) + "\"}");
+
+      // httpCode will be negative on error
+      if (httpCode > 0) {
+        // HTTP header has been send and Server response header has been handled
+        Serial.printf("[HTTP] POST... code: %d\n", httpCode);
+
+        // file found at server
+        // if (httpCode == HTTP_CODE_OK) {
+        if (httpCode == HTTP_CODE_CREATED) {
+          const String& payload = http.getString();
+          Serial.println("received payload:\n<<");
+          Serial.println(payload);
+          Serial.println(">>");
+          displaySuccess();
+        }
+      } else {
+        Serial.printf("[HTTP] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
+        displayError();
+      }
+
+      http.end();
+    }
+}
+void array_to_string(byte array[], unsigned int len, char buffer[])
+{
+   for (unsigned int i = 0; i < len; i++)
+   {
+      byte nib1 = (array[i] >> 4) & 0x0F;
+      byte nib2 = (array[i] >> 0) & 0x0F;
+      buffer[i*2+0] = nib1  < 0xA ? '0' + nib1  : 'A' + nib1  - 0xA;
+      buffer[i*2+1] = nib2  < 0xA ? '0' + nib2  : 'A' + nib2  - 0xA;
+   }
+   buffer[len*2] = '\0';
+}
+
+void displayError()
+{
+  for (unsigned int i = 0; i < 6; i++)
+  {
+    digitalWrite(LED_BUILTIN, LOW);
+    delay(600);
+    digitalWrite(LED_BUILTIN, HIGH);
+    delay(300);
+  }
+}
+
+void displaySuccess()
+{
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(300);
+}